Fixed #12450 -- GEOSFree was really added in GEOS 3.1.1, not 3.1.0.…

… Thanks, jpwatts for the bug report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12004 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/gis/geos/prototypes/errcheck.py

@@ -7,8 +7,8 @@
 
 # Getting the `free` routine used to free the memory allocated for
 # string pointers returned by GEOS.
-if GEOS_VERSION >= (3, 1, 0):
-    # In versions 3.1 and above, `GEOSFree` was added to the C API
+if GEOS_VERSION >= (3, 1, 1):
+    # In versions 3.1.1 and above, `GEOSFree` was added to the C API
     # because `free` isn't always available on all platforms.
     free = lgeos.GEOSFree
     free.argtypes = [c_void_p]